Friction characteristics of post-tensioning tendons in full-scale structures

Kim, Sang-Hyun; Park, Sung Yong; Park, YoungHwan; Jeon, Se-Jin

doi:10.1016/j.engstruct.2019.01.026

Cited by 17 publications

(5 citation statements)

References 16 publications

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“…In this regard, the optical fiber sensor has the inherent advantages of no additional installation, inherent stability, and strong anti-interference [5]. Kim et al [6] previously noticed fiber Bragg grating (FBG) coupling at the center of the central wire of a 7-wire steel strand, extended the range of FBG with polyamide recoating and casing, and then applied it to monitor the internal prestress loss of concrete I-beams with a span of 20 meters [7][8][9]. Jeon et al [10,11] investigated the temperature compensation of a smart steel strand and evaluated its friction resistance.…”

Section: Introductionmentioning

confidence: 99%

Application research on internal prestress monitoring of box girder based on FBG self-sensing steel strand

Zeng,

Zhu,

Liu

et al. 2024

Preprint

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Internal prestressing is an effective prestressing approach in the concrete box girder that ultimately plays a vital role in their construction. In practical engineering, accurate measurement and long-term monitoring are still challenging. FBG-based self-sensing steel strand (FSS) possesses the advantages of quasi-distributed monitoring of internal cable prestress and long-term stable monitoring. To examine its application in monitoring the internal prestressing of the actual box girder project, as well as to reveal the law of prestressing distribution and prestressing loss in the box girder, the self-sensing steel strand is appropriately experimented by using the cyclic tensile test. Precast and cast-in-place beams are then selected to examine the prestressing process and long-term prestressing monitoring of box girders with single-ended and double-ended tensioning processes. The results reveal that the linearity of FSS is 0.84%, the hysteresis is 0.75%, and the repeatability is 1.87%, which exhibits a good prestress monitoring performance. In the comparative application with the Elasto-Magnetic sensor and the reverse tension method, the instantaneous prestress monitoring results are basically consistent with the Elasto-Magnetic sensor. Due to the influence of the friction resistance of the anchorage, it is slightly lower than the measured value of the reverse tension method. Therefore, the FSS exhibits the accuracy of prestress monitoring and consistency of the actual box girder engineering application. In the monitoring of instantaneous prestress loss, such a loss at the tension end of the box girder mostly caused by the internal shrinkage of prestressed tendon, accounting for 81.3 % on average. The mid-span and the fixed end of the box girder, which experience tension under the single-ended tension conditions, are affected by friction and concrete compression loss. Therefore, reducing the amount of shrinkage of steel strands and adopting the double-ended tension method is still the key to reducing the instantaneous prestress loss. In the long-term prestress loss, the measured value exhibits a certain discontinuity. Compared to the theoretical value, the amount of prestress loss of the box girder tensioned at both ends is linearly positively correlated with the magnitude of applied effective prestress, and the amount of loss is negatively correlated with channel curvature.

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Section: Introductionmentioning

confidence: 99%

Application research on internal prestress monitoring of box girder based on FBG self-sensing steel strand

Zeng,

Zhu,

Liu

et al. 2024

Preprint

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“…Rawi et al [5] have compared the behaviour of prestressed slabs with traditionally reinforced concrete slabs under low-velocity impacts. Kim et al [6] conducted tests on full-size specimens of PSC bridge girders to obtain friction characteristics of post-tensioning tendons. Szydłowski and Łabuzek [7] analysed shrinkage, creep and prestressing losses in post-tensioned concrete beams as a result of using a lightweight aggregate obtained by sintering fly ash.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Research of Post-Tensioned Concrete Beams

Jancy,

Stolarski,

Zychowicz

2023

Materials

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The purpose of this paper is to present a new approach for the modelling of post-tensioned beams with calibration of the FE model to experimental results until the load capacity and post-critical state are reached. Two post-tensioned beams with different nonlinear tendon layouts were analysed. Material testing for concrete, reinforcing steel and prestressing steel was performed prior to the experimental testing of the beams. The Hypermesh program was used to define the geometry of the spatial arrangement of the finite elements of the beams. The Abaqus/Explicit solver was used for numerical analysis. The concrete damage plasticity model was used to describe the behaviour of concrete with different laws of elastic–plastic stress–strain evolution for compression and tension. Elastic-hardening plastic constitutive models were used to describe the behaviour of steel components. An effective approach to modelling the load was developed, supported by the use of Rayleigh mass damping in an explicit procedure. The presented model approach ensures good agreement between numerical and experimental results. The crack patterns obtained in concrete reflect the actual behaviour of structural elements at every loading stage. Random imperfections found during experimental studies on the results of numerical analyses were also discussed.

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“…The usability and safety of the structures are affected by the degraded performance [1][2][3]. In fact, cases of collapse of deteriorated bridge structures have been reported [4][5][6], and various strengthening methods have been proposed for restoring and improving performance along with widespread awareness of the importance of structure maintenance [7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Strengthening Effect of the External Prestressing Method That Simulated a Deterioration Bridge

et al. 2021

Self Cite

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Various methods for strengthening existing structures have been developed owing to the increase in human and property damages caused by the deterioration of structures. Among the various reinforcing methods, the external prestressing method increases the usability and safety of a structure by directly applying tension to the weak tensile area that suffers the greatest deflection during the structure usage. The external prestressing method is advantageous in reducing cracks caused by the introduced tension and restoration of the deflection. Since the strengthening method is applied to deterioration bridges, the strengthening effect is affected by the condition of the existing structure. However, studies on the strengthening effect according to the degree of deterioration are insufficient. Therefore, the behavior according to the strengthening status was analyzed, and the strengthening effect was identified in this study by simulating the deteriorated bridge, reducing the compressive strength and reinforcement quantity, and conducting a four-point loading test. As a result of the experiment, a reinforcement effect of 215% crack load, 161% yield load, and the difference in behavior according to the reinforcement parameters were confirmed.

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Friction characteristics of post-tensioning tendons in full-scale structures

Cited by 17 publications

References 16 publications

Application research on internal prestress monitoring of box girder based on FBG self-sensing steel strand

Application research on internal prestress monitoring of box girder based on FBG self-sensing steel strand

Experimental and Numerical Research of Post-Tensioned Concrete Beams

Strengthening Effect of the External Prestressing Method That Simulated a Deterioration Bridge

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